H. K. Park, R. A. Burnstein, A. Chakravorty, Y. C. Chen, W. S. Choong, K. Clark, E. C. Dukes, C. Durandet, J. Felix, Y. Fu, G. Gidal, H. R. Gustafson, T. Holmstrom, M. Huang, C. James, C. M. Jenkins, T. Jones, D. M. Kaplan, L. M. Lederman, N. Leros, M. J. Longo, F. Lopez, L. C. Lu, W. Luebke, K. B. Luk, K. S. Nelson, J. -P. Perroud, D. Rajaram, H. A. Rubin, J. Volk, C. G. White, S. L. White, P. Zyla
Published 2005-01-07, updated 2005-01-24Version 2
We report the first evidence for the decay Sigma+ -> p mu+ mu- from data taken by the HyperCP experiment(E871) at Fermilab. Based on three observed events, the branching ratio is B(Sigma+ -> p,mu+,mu-) = [8.6 +6.6,-5.4(stat) +/-5.5(syst)] x 10**-8. The narrow range of dimuon masses may indicate that the decay proceeds via a neutral intermediate state, Sigma+ -> p P0, P0 -> mu+ mu-, with a P0 mass of 214.3 +/- 0.5 MeV/c**2 and branching ratio B(Sigma+ -> p P0; P0 -> mu+ mu-) = [3.1 +2.4,-1.(stat) +/-1.5(syst)] x 10**-8.
Comments: As published in PRL
Journal: Phys.Rev.Lett.94:021801,2005
First Evidence for $B_s^0 \to φφ$ Decay and Measurements of Branching Ratio and $A_{CP}$ for $B^+ \to φK^+$
Measurement of the Branching Ratio B(D+ --> rho^0 l nu)/B(D+ --> K*0 l nu)
Measurement of the $K^+\toπ^+ν\barν$ Branching Ratio
